HMPID/AliHMPIDHelix.cxx

   1 /**************************************************************************
   2  * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
   3  *                                                                        *
   4  * Author: The ALICE Off-line Project.                                    *
   5  * Contributors are mentioned in the code where appropriate.              *
   6  *                                                                        *
   7  * Permission to use, copy, modify and distribute this software and its   *
   8  * documentation strictly for non-commercial purposes is hereby granted   *
   9  * without fee, provided that the above copyright notice appears in all   *
  10  * copies and that both the copyright notice and this permission notice   *
  11  * appear in the supporting documentation. The authors make no claims     *
  12  * about the suitability of this software for any purpose. It is          *
  13  * provided "as is" without express or implied warranty.                  *
  14  **************************************************************************/
  15
  16 /* $Id$ */
  17
  18 #include "AliHMPIDHelix.h" //class header
  19 #include <TPolyLine3D.h>  //Draw()
  20
  21 ClassImp(AliHMPIDHelix)
  22 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  23 void  AliHMPIDHelix::Print(Option_t *opt) const
  24 {
  25 // Debug printout
  26   Printf("%s helix for Q=%i in B=(0,0,%.2f) tesla",opt,fQ,fBz);
  27   Printf("Helix parametrised  @ x0=(%6.2f,%6.2f,%6.2f) cm p0=(%6.2f,%6.2f,%6.2f) GeV  P=%.2f GeV Theta=%.2f Phi=%.2f degrees",
  28                                 fX0.X(),fX0.Y(),fX0.Z(),    fP0.Px(),fP0.Py(),fP0.Pz(), fP0.Mag(),fP0.Theta()*TMath::RadToDeg(),fP0.Phi()*TMath::RadToDeg());
  29 }
  30 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  31 void AliHMPIDHelix::Draw(const Option_t *)
  32 {
  33 // Draw helix by a set of points seperated by 1 cm distance
  34   TVector3 pos,mom;
  35   const Int_t kNpoints=500;
  36   TPolyLine3D *pHelDraw = new TPolyLine3D(kNpoints); pHelDraw->SetLineColor(kGreen);
  37   for(Int_t i=0;i<kNpoints;i++) {
  38     Propagate(i,pos,mom);
  39     pHelDraw->SetPoint(i,pos.X(),pos.Y(),pos.Z());
  40   }
  41   pHelDraw->Draw();
  42 }